CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares	Oct. 31, 2016	Jul. 31, 2016
Class A nonvoting common stock
Common stock, shares issued	51,261,487	51,261,487
Common stock, shares outstanding	47,334,496	46,920,974
Treasury stock, shares	3,926,991	4,340,513
Class B Voting Common Stock
Common stock, shares issued	3,538,628	3,538,628
Common stock, shares outstanding	3,538,628	3,538,628